The public is being encouraged to watch wallers compete in professional, semi-professional and amateur categories.

Experts in other rural skills such as hedge-laying will also be available to discuss the value of stock boundaries. Details of relevant courses will be available.

The National Trust will lead a walk around Dyffryn Mymbyr from midday.

A society spokesman said: “Our aim is to bring together as many related skills and practices as possible in one event – the common link being the crafts and the benefit they have for agriculture, the environment, our landscape and the economy too.

“This will help show that loss of the skills is likely to have an adverse effect on the wildlife.”